Tread for a step



FIG. 1 is a top, front, and left side perspective view of a tread for astep according to our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The dash-dash broken lines illustrate portions of the tread for a stepthat form no part of the claimed design. The dot-dash broken linesrepresent boundaries of the claim and form no part of the claimeddesign.

CLAIM The ornamental design for a tread for a step, as shown anddescribed.